Can you share more information about how you're referencing the library, and a small repro so we can take a closer look? If you can share this on a GH repo, that would be very helpful.
– Fabio CavalcanteMar 3 '17 at 20:05

Michael, I'll be taking a look at this ASAP. Do you have a small repro that isolates the issue? Can you also confirm that restarting the site had no effect on this issue?
– Fabio CavalcanteMar 21 '17 at 4:21

Have also been taking a look at some of your logs from this timeframe and most of the errors I'm seeing are unrelated to this particular problem. The one instance I see of this issue does seem to be indeed caused by missing DLLs. There's a package restore and some file changes a few successful executions (followed to additional iterations on the code). Did you happen to accidentally deploy the lock file with the function? Also, it would likely be easier to manage and safter if you deployed this native DLL with your files rather than placing it in the nuget cache.
– Fabio CavalcanteMar 21 '17 at 4:52